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A kind of lutetium aluminate green fluorescent powder and its preparation method and application

A technology of green fluorescent powder and lutetium aluminate, which is applied to chemical instruments and methods, light sources, luminescent materials, etc., can solve the problems of high energy consumption, poor luminous brightness, and complicated preparation methods, and achieve low energy consumption and average particle size. The effect of small diameter and high light conversion efficiency

Active Publication Date: 2019-01-29
HEBEI LIFU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lutetium aluminate green phosphor and its preparation method and application, so as to solve the problems in the prior art that the lutetium aluminate green phosphor has poor luminous brightness, complicated preparation method and high energy consumption , to provide more options for the preparation of white LEDs

Method used

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  • A kind of lutetium aluminate green fluorescent powder and its preparation method and application
  • A kind of lutetium aluminate green fluorescent powder and its preparation method and application
  • A kind of lutetium aluminate green fluorescent powder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] According to the chemical formula Ce 0.02 Lu 2.97 sc 0.01 Al 5 o 12 The molar ratio of each element in the method weighs the oxide or carbonate raw material containing Ce, Lu, Sc, Al elements, then puts the said raw material in a mortar and grinds it, and mixes it evenly to obtain a mixture; add the raw material to the mixture Total mass 3% flux H 3 BO 3 , and mix evenly, and then put it in a corundum crucible; put the crucible in a pusher furnace, under the protection of a reducing atmosphere of nitrogen and hydrogen mixed gas, raise the temperature to 1430°C at a rate of 10°C / min, and keep it for 2h, then Naturally cool to room temperature to obtain crude phosphor powder; grind and sieve the crude phosphor powder, wash with hydrochloric acid solution with a concentration of 10% by mass, and dry at 80°C for 2 hours to obtain lutetium aluminate green phosphor Ce 0.02 Lu 2.97 sc 0.01 Al 5 o 12 . Characterize the obtained product, the results are as follows: f...

Embodiment 2-12

[0031] The sintering temperature and sintering time in the phosphor powder preparation process were changed (see Table 1 for details), and the other raw materials and processes were the same as in Example 1. The relative performance of the prepared phosphor powder was tested, and the results are shown in Table 1.

[0032] Table 1:

[0033]

[0034]

[0035] It can be seen from Table 1 that when the sintering temperature is 1300-1500°C, the relative brightness of the lutetium aluminate phosphor reaches more than 100, which is better than that of Comparative Example 1. When the sintering temperature is lower than 1300°C or higher than 1500°C, the The brightness of the fluorescent powder is reduced. In addition, the sintering temperature is too high and the process conditions are more difficult to control. When the sintering temperature is 1430 ° C, the relative brightness of the phosphor is the highest, and the internal quantum efficiency of the QE test is the highest. The...

Embodiment 13-23

[0037] The amount and type of M were changed, the amount of Ce was changed (see Table 2 for details), other raw materials and processes were the same as in Example 1, and the relative performance of the prepared phosphor was tested, and the results are shown in Table 2.

[0038] Table 2:

[0039]

[0040] As can be seen from Table 2, the present invention effectively improves the relative brightness of the fluorescent powder by adding elements such as Ce and Sc. Within the specified range of dosing, the relative brightness of the fluorescent powder is higher than that of Comparative Example 1. When Ce and M When the incorporation amount is 2:1, the obtained phosphor has good comprehensive performance, relatively high brightness, and relatively high internal quantum efficiency in QE test, indicating that the light efficiency is relatively high.

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Abstract

The invention provides a lutetium aluminate green fluorescent powder having a chemical general formula represented by Ce[x]Lu[3-x-y]M[y]Al[5]O[12], wherein M is at least one of La, Gd, Pr, Nd, Sm, Eu, Ga, Tb, Dy, Ho, Er, Tm, Yb and Sc, 0<x<0.1, and 0<y<0.1. The fluorescent powder is prepared by a high temperature solid phase method, and the synthesis temperature is 1300-1500 DEG C; the prepared fluorescent powder has the advantages of good optical properties, no impurity phases, good crystallization and basically no agglomeration, has nearly spherical particles and has the median particle size D50 adjustable in the range of 8-12 [mu]m; at the same time, the fluorescent powder has the advantages of relatively wide excitation spectra, high relative brightness, simple preparation process, low energy consumption, and environmental protection. The green fluorescent powder provided by the invention is suitable for preparation of white LED devices with combination of other primary-color fluorescent powders, and can be applied in the fields of illumination or display systems and the like.

Description

technical field [0001] The invention relates to a luminescent material and its preparation method and application, in particular to a lutetium aluminate green fluorescent powder and its preparation method and application. Background technique [0002] White LED is known as the fourth-generation lighting source. Compared with traditional lighting sources, it has the advantages of high luminous efficiency, low energy consumption, long service life, environmental protection and no pollution. It is mainly used in LED backlights, mobile communications, car lights, transportation Signal lights, indoor and outdoor lighting and other fields have broad market prospects. [0003] At present, the mainstream white LED is to use InGaN blue chip to excite YAG: Ce 3+ Phosphor powder produces yellow light that is complementary to blue light, and then mixed to realize white light LED. This method is not only simple and easy, and the process conditions are relatively mature, but also the YA...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80H01L33/50F21V9/45C01F17/00F21Y115/10
CPCC01F17/34C01P2004/03C01P2004/61C01P2006/60C09K11/7774F21V9/30H01L33/502
Inventor 杨志平穆茂林刘芳赵金鑫
Owner HEBEI LIFU CHEM TECH
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